Was there at 2.10pm , my eldest went through scanner no problem, I put my grandson through next no problem , next son went through no problem, Mine did not scan said ticket rejected or something like that, Stewards not a clue what to do? guy eventually appeared with a hand held scanner, did not scan ended up letting me walk through the big exit door! so 1 in 4 about right. We were also in the top tier turnstiles 7-8! Another four people waiting after me to be re scanned.